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I had asked this question at an initial level before; thank you to all with your suggestions. Now this problem is getting complicated and I am unable to figure it out. There is a 10x10 matrix of zeros (call it tab). The first row of tab needs to be replaced with the first row of tab1 (3x10 matrix)

I had asked this question at an initial level before; thank you to all with your suggestions. Now this problem is getting complicated and I am unable to figure it out. There is a 10x10 matrix of zeros (call it tab). The first row of tab needs to be replaced with the first row of tab1 (3x10 matrix)

I had asked this question at an initial level before; thank you to all with your suggestions. Now this problem is getting complicated and I am unable to figure it out. There is a 10x10 matrix of zeros (call it tab). The first row of tab needs to be replaced with the first row of tab1 (3x10 matrix)

I had asked this question at an initial level before; thank you to all with your suggestions. Now this problem is getting complicated and I am unable to figure it out. There is a 10x10 matrix of zeros (call it tab). The first row of tab needs to be replaced with the first row of tab1 (3x10 matrix)

I had asked this question at an initial level before; thank you to all with your suggestions. Now this problem is getting complicated and I am unable to figure it out. There is a 10x10 matrix of zeros (call it tab). The first row of tab needs to be replaced with the first row of tab1 (3x10 matrix) tab1= {{1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, {2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {3, 3, 3, 3, 3, 3, 3, 3, 3, 3}} rnorms is a matrix 10x10 of random normal variables: you can define it whatever way you want

The issue is that subsequent rows of tab depend on the previous rows of tab given tab[[1]]=tab1[[1]]: alpha=.011, sigma=0.127 tab[[2]]=1.011tab[[1]]+0.127rnorms[[1]]tab[[1]] tab[[3]]=1.011tab[[2]]+0.127*rnorms[[1]]*tab[[2]] and so on. For each value of tab1[[1]], I will get a matrix of tab; so the matrix should be repeated 3 times. For each time, I want to store the sum of the columns of the matrix. The resulting matrix (of sums of columns) should have dimensions 3x10.

For getting the matrix tab to be repeated 3 times (based on the values of tab1), I have tried (NestList[{(1 + alpha) #[[1]] + sigma rnorms[[#[[2]]]] #[[1]], #[[2]] + 1} &, {#, 1}, 9] & /@ tabl)

which is giving me the wrong result (I have tried to compute each matrix manually by replacing the first row of tab). More so, I get {{{{1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 1}, {{1.09703, 1.0021, 1.04791, 1.10641, 0.836817, 0.950917, 1.18247, 0.941276, 1.07136, 1.01164}, 2},......... {{{2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, 1}, {{2.19405, 2.00421, 2.09581, 2.21281, 1.67363, 1.90183, 2.36493, 1.88255, 2.14271, 2.02327}, 2}, {{2.21106, 1.95679, 2.35947, 2.00476, 1.31318, 2.25086, 1.93982, 1.83749, 2.5103, 1.896}, 3},.........and so on.

The above command of NestList is not taking each row of rnorms and multiplying it with the given row of tab1[[1]] and then computing the whole matrix each time. I would appreciate any help.

I had asked this question at an initial level before; thank you to all with your suggestions. Now this problem is getting complicated and I am unable to figure it out. There is a 10x10 matrix of zeros (call it tab). The first row of tab needs to be replaced with the first row of tab1 (3x10 matrix)

tab1= {{1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, {2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, {3, 3, 3, 3, 3, 3, 3, 3, 3, 3}} 

rnorms is a matrix 10x10 of random normal variables: you can define it whatever way you want

The issue is that subsequent rows of tab depend on the previous rows of tab given

tab[[1]]=tab1[[1]]: alpha=.011, sigma=0.127 tab[[2]]=1.011*tab[[1]]+0.127*rnorms[[1]]*tab[[1]] tab[[3]]=1.011*tab[[2]]+0.127*rnorms[[1]]*tab[[2]] 

and so on. For each value of tab1[[1]], I will get a matrix of tab; so the matrix should be repeated 3 times. For each time, I want to store the sum of the columns of the matrix. The resulting matrix (of sums of columns) should have dimensions 3x10.

For getting the matrix tab to be repeated 3 times (based on the values of tab1), I have tried

(NestList[{(1 + alpha) #[[1]] + sigma rnorms[[#[[2]]]] #[[1]], #[[2]] + 1} &, {#, 1}, 9] & /@ tabl) 

which is giving me the wrong result (I have tried to compute each matrix manually by replacing the first row of tab). More so, I get

{{{{1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, 1}, {{1.09703, 1.0021, 1.04791, 1.10641, 0.836817, 0.950917, 1.18247, 0.941276, 1.07136, 1.01164}, 2},......... {{{2, 2, 2, 2, 2, 2, 2, 2, 2, 2}, 1}, {{2.19405, 2.00421, 2.09581, 2.21281, 1.67363, 1.90183, 2.36493, 1.88255, 2.14271, 2.02327}, 2}, {{2.21106, 1.95679, 2.35947, 2.00476, 1.31318, 2.25086, 1.93982, 1.83749, 2.5103, 1.896}, 3},......... 

and so on.

The above command of NestList is not taking each row of rnorms and multiplying it with the given row of tab1[[1]] and then computing the whole matrix each time. I would appreciate any help.